moth vs lepidopteran

moth and lepidopteran both are nouns.

Word	Noun	Adjective	Verb	Adverb
moth	Yes	No	No	No
lepidopteran	Yes	No	No	No

As nouns, lepidopteran is a hypernym of moth; that is, lepidopteran is a word with a broader meaning than moth:

moth: typically crepuscular or nocturnal insect having a stout body and feathery or hairlike antennae
lepidopteran: insect that in the adult state has four wings more or less covered with tiny scales

Other hypernyms of moth include lepidopteron, lepidopterous insect.

moth (noun)	lepidopteran (noun)
typically crepuscular or nocturnal insect having a stout body and feathery or hairlike antennae	insect that in the adult state has four wings more or less covered with tiny scales